Volcanic Activity Summary: CORRECTION OF ALERT LEVEL TO WARNING. Another significant explosive event occurred at Redoubt Volcano at approximately 5:58 am AKDT (13:58 UTC). At this time, the cloud height is estimated to be 50,000 feet based on National Weather Service radar. The cloud is drifting to the southeast of the volcano. AVO seismometers indicate a lahar has developed in the Drift River Valley.

Next Notice: A new VAN will be issued if conditions change significantly or alert levels are modified. While a VAN is in effect, regularly scheduled updates are posted athttp://www.avo.alaska.edu

The Alaska Volcano Observatory is a cooperative program of the U.S. Geological Survey, the University of Alaska Fairbanks Geophysical Institute, and the Alaska Division of Geological and Geophysical Surveys.

(1) VOLCANO OBSERVATORY NOTICE FOR AVIATION (VONA)

(2) Issued:

(20090404/1451Z)

(3) Volcano:

Redoubt (CAVW# 1103-03-)

(4) Current Color Code:

RED

(5) Previous Color Code:

(6) Source:

Alaska Volcano Observatory

(7) Notice Number:

2009/A33

(8) Volcano Location:

N 60 deg 29 min W 152 deg 44 min

(9) Area:

Cook Inlet-South Central Alaska

(10) Summit Elevation:

10197 ft (3108 m)

(11) Volcanic Activity Summary:

CORRECTION OF ALERT LEVEL TO WARNING. Another significant explosive event occurred at Redoubt Volcano at approximately 5:58 am AKDT (13:58 UTC). At this time, the cloud height is estimated to be 50,000 feet based on National Weather Service radar. The cloud is drifting to the southeast of the volcano. AVO seismometers indicate a lahar has developed in the Drift River Valley.